What someone writes when insecure about his abilities as a physicist or mathematician to make themselves feel smarter than they likely are. Typically used by douchebags who think they are doing something amazing by proving a problem from a textbook. Usually follows a terribly formed proof which lacks rigor or reasoning.
"x+y=2. Clearly, z=4, QED."
"You're obviously incorrect, as is seen without proof. QED"
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